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BOULDER - Deputies have identified the substance in the poisoned meatballs that sickened at least three dogs who ate them in a Gunbarrel park earlier this year.

The Boulder County Sheriff's Office says it's one of the most widely used pesticides and is an active ingredient in two of three commonly sold rat poisons.

The reward to find whoever left the meatballs is now over $4,000.

(KUSA-TV © 2014 Multimedia Holdings Corporation)

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